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Goodwill and Intangible Assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Major Class of Intangible Asset (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 501,407 | $ 476,191
Intangible assets - Gross Carrying Amount | 592,307 | 567,091
Amortized intangible assets - Accumulated Amortization | (201,399) | (183,764)
Amortized intangible assets - Net | 300,008 | 292,427
Intangible assets - Net | 390,908 | 383,327
Banjo trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 62,100 | 62,100
Akron Brass trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 28,800 | 28,800
Patents |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | 6,583 | 6,468
Amortized intangible assets - Accumulated Amortization | (5,135) | (4,693)
Amortized intangible assets - Net | $ 1,448 | 1,775
Amortized intangible assets - Weighted Average Life | 12 years |
Trade names |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 120,744 | 115,899
Amortized intangible assets - Accumulated Amortization | (62,299) | (57,227)
Amortized intangible assets - Net | $ 58,445 | 58,672
Amortized intangible assets - Weighted Average Life | 16 years |
Customer relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 273,413 | 256,202
Amortized intangible assets - Accumulated Amortization | (92,692) | (85,652)
Amortized intangible assets - Net | $ 180,721 | 170,550
Amortized intangible assets - Weighted Average Life | 14 years |
Unpatented technology |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 99,967 | 96,922
Amortized intangible assets - Accumulated Amortization | (40,713) | (35,685)
Amortized intangible assets - Net | $ 59,254 | 61,237
Amortized intangible assets - Weighted Average Life | 12 years |
Other |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 700 | 700
Amortized intangible assets - Accumulated Amortization | (560) | (507)
Amortized intangible assets - Net | $ 140 | $ 193
Amortized intangible assets - Weighted Average Life | 10 years |

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